CVE-2026-48932

A flaw in Node.js HTTP client can cause a request desynchronization for Node.js-based forwarding proxies that rebuild outbound headers from the visible `IncomingMessage` headers while piping the original body to a reused backend connection. Node.js can omit headers beyond `maxHeadersCount` / `maxHeaderPairs` from `req.headers`, `req.rawHeaders`, and `req.headersDistinct`, while still using those omitted headers internally for HTTP message framing. In particular, `Content-Length` can be hidden from userland while the request body is still delivered. This vulnerability affects all supported release lines: **Node.js 22**, **Node.js 24**, and **Node.js 26**.

CVSS v3 3.7 LOW

3.7^/10

CVSS v3 : LOW

Vector : AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

Exploitability : 2.2 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://hackerone.com/reports/3564941

Configurations

No configuration.

History

No history.

Information

Published : 2026-09-01 03:16

Updated : 2026-09-03 17:02

NVD link : CVE-2026-48932

Mitre link : CVE-2026-48932

CVE.ORG link : CVE-2026-48932

JSON object : View

Products Affected

No product.

CWE

CWE-444

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

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